Brush and method of making same.



PATENTED MAY 26, 1903.

W. J. WALLACE. BRUSH AND METHOD OF MAKING SAME. APPLICATION FILED PBB.27.1903.

NO MODEL.

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Wifzeasefi Maia? JWalZace UNITED STATES Patented May 26, 1903.

PATENT OFFICE.

WILLIAM J. WALLACE, OF NEW YORK, N. 'Y. ASSIGNOR TO GOLDMARK AND WALLACE, OF NEW YORK, N. Y., A 'COPARTNERSI-IIP.

BRUSH AND METHOD OF MAKING SAME.

SPECIFICATION formingpart. of Letters Patent N 0. 729,458, dated May 26, 1903.

Application filed February 2'7, 1903. Serial No. 145,368. (No model.)

To all whom itmcty concern:

Be it known that I, WILLIAM J. WALLACE, a citizen of the United States of America, and

a resident of New York, in the county and.v

that is, so wound that the strands of the cloth would run parallel with and at right angles to the sides of the brush, leaving a free edge running longitudinally of the body of the brush. This free edge of thecloth was then soldered to the side of the brush in order to properly secure it in position. This was found highly disadvantageous, as this soldered seam would cut into the commutator and injure the same. I To overcome this difficulty, the wire-cloth was then wound on the biasthat is, so wound that the strands would run diagonally with relation to the sides of the brush. The free end of the wirecloth, which in that case would be at the rear end of the brush, was then soldered to finish the brush. This method has also been found to be objectionable in that it forms a brush having a very low conductivity by reason of the wires running diagonally to the sides of the body of the brush and also in that a great deal of material is wasted as scrap.

To overcome the difficulties presented here is the object of my invention.

Other objects will appear as the specification proceeds.

I shall describe a method of manufacturing brushes for dynamo-electric machines and the productobtained by the same embodying my invention and afterward point out the novel features in the claims.

In the drawings I have suitably illustrated the various steps involved in my process and also the product obtained by such process; but changes may of course be made without departing from the spirit of my invention.

In the said drawings, Figure l is an end ering of wire fabric.

unfinished product after it has been subjected to a preliminary pressure, showing the free edge. Fig. 4: shows the free edge turned into the body of the brush. Fig. 5 shows the finished brush and seam after it has been resubjected to pressure. an end andside view of awire cable wound with a piece. of wire fabric. Fig. 8 shows a plurality of separately wound wire cables forming a core surrounded by an outside covfinished product after it has been subjected to a preliminary pressure. Fig. 10 shows the free edge turned into the body of the brush. Fig. 11 shows'the finished brush and seam after it has been resubjected to pressure. shows the finished product when wound on the straight. Fig. 13 shows the finished product when wound on the bias. Fig. 14 shows an unfinished product composed of a single cable wound with wire-cloth and having its free edge turned in.

Similar letters of reference indicate corresponding parts in the different views.

In the present invention the wire cloth or fabric A can be wound either on the straight or on the bias; but I prefer, as shown in Figs. 1 and 2, to wind it on the straight. After this the unfinished product is subjected to a preliminary pressure to form it into shape, as shown in Fig. 3. wire-cloth is then turned into the body of the brush, as shown in Fig. 4, after which the brush is resubjected to pressure, thereby finishing it and also permanently retaining the free edge a. in the brush by the formation of the seam (L as shown in Fig. 5. This forms a very desirable brush, as no soldered seam is necessary, owing to the free edge being turned into the body of the brush and retained there. however, is shown in Figs. 7, 8, 9, 10, and 11. In this instance a core composed of a plurality of wire cables is used. This core can be simply surrounded by an outside covering common to all the cables; but, as shown in 100 the drawings, I prefer to wind each cable B 4 with a separate piece of wire-cloth b and then Figs. 6 and 7 show 60 Fig. 9 shows the un- 6 Fig. 12 70 The free edge a of the 85 The preferred construction,

to wind the cables so wound in a piece of wire fabric 19 common to them all, as shown in Fig. 8. The unfinished product is then subjected to a preliminary pressure, as shown in Fig. 9, after which the free edge 17 of the cloth is turned into the body of the brush, as shown in Fig. 10, when the said brush is resubjected to pressure and the seam b finished, as shown in Fig. 11.

The use of cables insures a higher conductivity and, moreover, has the effect of materially reducing the cost of manufacture, as wire cables are much less expensive than wire fabric.

By winding each cable separately with a piece of Wire-cloth a plurality of stiffeningcheeks b is formed, making the brush much better able to resist the pressure of the commutator, and yet admits of sufficient flexibility to compensate for unevenness in the running of the motor.

Figs. 12 and 13 show the finished brush wound, respectively, on the straight and on the bias.

In Fig. 14 is shown an unfinished brush composed of a single cable 0, surrounded by a piece of wire-cloth 0, having its free edge 0 turned in. The steps necessary to form the brush into shape are similar to the steps. described in connection with the other forms.

Having thus described myinvention, what I claim is l. The process of manufacturing brushes turning the free edge of the fabric into the body of the brush, and then finishing it by resubjecting it to pressure so as to form a seam by permanently retaining the free edge of the fabric in the body of the brush.

2. The process of manufacturing brushes for dynamo-electric machines which consists in windinga wire cable in a piece of wire fabric, then partially forming the unfinished product into shape by subjecting it to a preliminary pressure, then turning the free edge of the fabric into the body of the brush, and then finishing it by resubjecting it to pressure so as to form a seam by permanently retaining the free edge of the fabric in the body of the brush.

3. The process of manufacturing brushes for dynamo-electric machines which consists in winding a plurality of wire cables in a piece of wire fabric, then partially forming the unfinished product into shape by subjecting it to a preliminary pressure, then turning the free edge of the fabric into the body of the brush, andthen finishing it by resubjecting it to pressure so as to form a seam by permanently retaining the free edge of the fabric in the body of the brush.

4. The process of manufacturing brushes for dynamo-electric machines, which consists in winding each one of a plurality of wire cables separately in a piece of wire fabric,

then winding all the cables in a common piece of wire fabric, then partially forming the unfinished product into shape by subjecting it to a preliminary pressure, then turning the free edge of the outside wire fabric into the body of the brush, and then finishing it by resubjecting it to pressure so as to form a seam by permanently retaining the free edge of the fabric in the body of the brush.

5. That step in the manufacture of wirefabric brushes for dynamo-electric machines, which consists in turning the free edge, formed by winding the fabric, into the body of the brush and forming a seam by permanently retaining it there by pressure.

6. As a new article of manufacture, a brush for dynamo-electric machines, composed of wire fabric,'having its seam formed by having the free edge of the said fabric turned into the body of the brush.

7. As a new article of manufacture, a brush for dynamo-electric machines, havinga core of wire cables, separately wound with wire fabric, and an outside covering of wire fabric.

8. As a new article of manufacture, a brush for dynamo-electric machines, having a core of one or more wire cables, and an outside covering of wire fabric having its seam formed by having the free edge of the fabric turned into the body of the brush.

9. As a new article of manufacture, a brush for dynamo-electric machines, having a core of wire cables, separately wound with wire fabric, and an outside covering of wire fabric having its seam formed by having the free edge of the fabric turned into the body of the brush.

Signed at New York this 11th day of February, 1903.

WILLIAM J. WALLACE.

Witnesses:

AXEL V. BEEKEN, FREDERIC D. PANGBORN. 

